Why did the guards call the police

Hint 1 of 7:

You left the phone system intact. Look around the furnace room.

Hint 2 of 7:

Look to the right of the furnace, on the wall.

Hint 3 of 7:

OPEN PHONE BOX   +1

Hint 4 of 7:

Do you have anything that can cut the wires ?

Hint 5 of 7:

Did you search the storage room on the level your cell is on ?

Hint 6 of 7:

GET SCISSORS hanging above fire extinguisher.  +1